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2. Acoustic foam - Wikipedia

   en.wikipedia.org/wiki/Acoustic_foam

   Acoustic foam is a lightweight material made from polyurethane (either polyether or polyester) or extruded melamine foam. [8] It is usually cut into tiles. One surface of these tiles often features pyramid, cone, wedge, or uneven cuboid shapes.

3. Acoustic attenuation - Wikipedia

   en.wikipedia.org/wiki/Acoustic_attenuation

   Acoustic attenuation in many metals and crystalline materials is frequency-independent, namely =. [10] In contrast, it is widely noted that the η {\displaystyle \eta } of viscoelastic materials is between 0 and 2.

4. Sound attenuator - Wikipedia

   en.wikipedia.org/wiki/Sound_attenuator

   A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

5. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather than a power source. Active noise canceling is best suited for low frequencies.

6. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   The Outdoor–Indoor Transmission Class (OITC) is a standard used for indicating the rate of sound transmission from outdoor noise sources into a building. It is based on the ASTM E-1332 Standard Classification for Rating Outdoor-Indoor Sound Attenuation. [ 37 ]

7. These 89 Appetizers Might Just Be The Best Part Of ... - AOL

   www.aol.com/lifestyle/89-appetizers-might-just...

   Turkey Cheese Ball. Even if you're not serving turkey this Thanksgiving doesn't mean you can't get in on the theme. Enter: this adorable cheeseball.We used carrots, pecans, pretzels, and bell ...